Exhibit 21



Subsidiaries of the Registrant



The following are subsidiaries of the Registrant as of December 31, 2010 and the
jurisdiction in which each is organized. Each of the subsidiaries generally conducts its business using the names indicated except as separately set forth herein. Certain subsidiaries are not listed. These omitted subsidiaries individually and in
the aggregate do not constitute a significant subsidiary.



|                                                                     |  |                                 
|-------------------------------------------------------------------- |  | --------------------------------
|Subsidiary                                                           |  | State or Country of
Organization
|Subsidiary of the Registrant:                                        |  |                                 
|CDI Corporation (a)                                                  |  | Pennsylvania                    
|Subsidiaries of CDI Corporation:                                     |  |                                 
|CDI-Aerospace, LLC (b)                                               |  | Delaware                        
|CDI AndersElite Limited                                              |  | United Kingdom                  
|CDI Architects, Inc.                                                 |  | Delaware                        
|CDI Business Solutions GmbH                                          |  | Germany                         
|CDI Caribe Operations LLC                                            |  | Puerto Rico                     
|CDI Marine Company (c)                                               |  | Florida                         
|C.D.I. Professional Services Group, S. de R.L. de C.V. (d)           |  | Mexico                          
|CDI Professional Services, Ltd.                                      |  | Canada                          
|CDI-TK, LLC                                                          |  | Delaware                        
|CTQ Engineering, LLC*                                                |  | Delaware                        
|Management Recruiters International, Inc. (e)                        |  | Delaware                        
|Maplehill Corporation                                                |  | Delaware                        
|The M & T Company (c)                                                |  | Pennsylvania                    
|Subsidiaries of CDI AndersElite Limited:                             |  |                                 
|CDI AndersElite Australia Pty Limited                                |  | Australia                       
|CDI AndersElite New Zealand Limited                                  |  | New Zealand                     
|CDI Contractor Services Limited                                      |  | United Kingdom                  
|CDI Gulf International for Petroleum Services, KSC*                  |  | Kuwait                          
|Subsidiaries of Management Recruiters International, Inc.:           |  |                                 
|Brownshill LLC                                                       |  | Delaware                        
|CDI-Infrastructure, LLC (f)                                          |  | Delaware                        
|Franchise Services of Ohio, Inc.                                     |  | Delaware                        
|MRI Contract Staffing, Inc.                                          |  | Ohio                            
|Subsidiaries of Brownshill LLC:                                      |  |                                 
|Brownshill Holdings Limited                                          |  | United Kingdom                  
|Browns Canyon Corporation                                            |  | Delaware                        
|Subsidiary of Brownshill Holdings Limited:                           |  |                                 
|MRIWW Franchise Services Ltd.                                        |  | United Kingdom                  
|Subsidiary of Maplehill Corporation:                                 |  |                                 
|Asset Computer Personnel Corporation                                 |  | Canada                          
|Subsidiary of C.D.I. Professional Services Group, S. de R.L. de C.V. |  |                                 
|CDIPycopsa Ingeniería Y Construcción, S. de R.L. de C.V.*           |  | Mexico                          
|Subsidiary of MRI Contract Staffing, Inc.:                           |  |                                 
|Access Point LLC                                                     |  | Delaware                        



|* | Not a wholly-owned subsidiary.
|- | ------------------------------

|(a) | CDI Corporation also conducts its business using the following names: CDI Business Solutions, CDI Engineering Solutions, CDI-Aerospace, CDI-Government Services, CDI-IT Solutions,
CDI-IT Services, CDI-Life Sciences, CDI-Process & Industrial, and CDI-Talent Management.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(b) | CDI-Aerospace, LLC also conducts its business using the name DSPCon.
|--- | --------------------------------------------------------------------

|(c) | CDI Marine Company and The M & T Company also conduct their business using the following names: CDI Government Services and CDI Engineering Solutions.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------

|(d) | C.D.I. Professional Services Group, S. de R.L. de C.V. also conducts its business using the name CDI.
|--- | -----------------------------------------------------------------------------------------------------

|(e) | Management Recruiters International, Inc. also conducts its business using (or grants to franchisees the right to use) the following names: MRI, MRINetwork, MRI Worldwide, Sales
Consultants, Office Mates 5 and CompuSearch.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(f) | CDI-Infrastructure, LLC also conducts its business using the name L.R. Kimball.
|--- | -------------------------------------------------------------------------------